Swim fin



FIG. 1 is a perspective view of the swim fin showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

CLAIM The ornamental design for a swim fin, as shown and described.